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The GNU Ada compiler

GNAT is a full-featured Ada 2005 compiler. A quote from
http://www.adaic.org says: "Easily reused and maintained, readable
and user friendly, Ada code facilitates such massive software
projects as the Space Station and the Paris Metro. It has proven to
be extraordinarily robust in decades' worth of daily field tests
under the most rigorous conditions in which millions of lives have
been at stake." Ada is the language for real-world, mission-critical
programming.